MESON Chess Problem Database

Problem Display
PID: 25878 (6q1/Qp6/n1p5/1Pp1n3/kP2R3/N5p1/2P3K1/R2Bb3 w - - 0 1)

Retter, Yosef

3rd Comm., McWilliam MT, 2000

6q1/Qp6/n1p5/1Pp1n3/kP2R3/N5p1/2P3K1/R2Bb3

#2

9 + 9

56 The Problemist 2001

SOLUTION

  • SOUND
  • Sets
    • 1...Qb3
      • 2.cxb3#
    • 1...Qh7
      • 2.c3#
    • 1...Qg5
      • 2.c3#
    • 1...Qg6
      • 2.c3#
    • 1...Qg7
      • 2.c3#
    • 1...Qa8
      • 2.c3#
    • 1...Qb8
      • 2.c3#
    • 1...Qc8
      • 2.c3#
    • 1...Qe8
      • 2.c3#
    • 1...Qf8
      • 2.c3#
    • 1...Qh8
      • 2.c3#
    • 1...Sc4
      • 2.c3#
    • 1...Sf7
      • 2.c3#
    • 1...c4
      • 2.c3#
    • 1...b6
      • 2.Qxa6#
  • Tries
    • 1.Sb1+?
      • 1...Kxb5
        • 2.Ra5#
        • 2.Qxb7#
      • 1...Qa2!
    • 1.Sc4+?
      • 1...Kxb5
        • 2.Sd6#
        • 2.Qb6#
        • 2.Qxb7#
      • 1...Kxb4!
  • Keys
    • 1.Qb6!
      • threat
        • 2.Qa5#
      • 1...Bxb4
        • 2.c4#
      • 1...Sxb4
        • 2.Qa7#
      • 1...cxb4
        • 2.Sc4#
      • 1...Sc4
        • 2.c3#
      • 1...Qd8
        • 2.Sb1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 14
  • Sets
    • Q(i);OGATE::P(C),XQ(i)
    • Q(i);N_GUARD::B(B)+P(C)
    • S(e);S_CUTQ(i)::B(B)+P(C)
    • P(d);S_CUTQ(i)::B(B)+P(C)
    • P(h);N_GUARD::QAR2(I),XS(f)
  • Tries
    • Try
      • S(E);CHECK
      • Refutation
        • Q(i);P_PINP(C),P_SPINQ(i)
    • Try
      • S(E);CHECK
      • Refutation
        • K(c);N_SPINS(f),P-FLIGHT,XP(F)
  • Actual
    • Q(I);N_PINS(f)
    • Threat
      • QAR1(I)
    • Vars
      • B(a);P_SPINB(a),SBLOCK,XP(F)::B(B)+P(C)
      • S(f);OGATEB,P_SPINS(f),XP(F)::QAR(I)
      • P(d);P_SPINP(d),SBLOCK,XP(F)::R(A)+S(E)
      • S(e);S_CUTQ(i)::B(B)+P(C)
      • Q(i);N_GUARD::R(A)+S(E)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).